期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 140, 期 3, 页码 1019-1027出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.7b10739
关键词
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资金
- National Natural Science Foundation of China [21474035, 51403071, 61722403, 11674121, 91733301]
- National High-tech R&D Program of China (863 Program) [2015AA034601]
- National Key Research and Development Program of China [2016YFB0201204]
- Recruitment Program of Global Youth Experts in China
- HUST Key Innovation Team for Interdisciplinary Promotion [2016JCTD111]
- Science and Technology Program of Shenzhen [JCYJ20160429182443609]
- Postdoctoral Science Foundation of China [2016M602289]
- Program for JLU Science and Technology Innovative Research Team
The environmental toxicity of Pb in organic-inorganic hybrid perovskite solar cells remains an issue, which has triggered intense research on seeking alternative Pb-free perovskites for solar applications. Halide perovskites based on group-VA cations of Bi3+ and Sb3+ with the same lone-pair ns(2) state as Pb2+ are promising candidates. Herein, through a joint experimental and theoretical study, we demonstrate that Cl-incorporated methylammonium Sb halide perovskites (CH3NH3)(3)Sb2ClxI9-x show promise as efficient solar absorbers for Pb-free perovskite solar cells. Inclusion of methylammonium chloride into the precursor solutions suppresses the formation of the undesired zero dimensional dimer phase and leads to the successful synthesis of high-quality perovskite films composed of the two-dimensional layered phase favored for photovoltaics. Solar cells based on the as-obtained (CH3NH3)(3)Sb2ClXI9-X films reach a record-high power conversion efficiency over 2%. This finding offers a new perspective for the development of nontoxic and low-cost Sb-based perovskite solar cells.
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